Valve-lifting mechanism.



WILLIAI JOHN SNADECKI, OF SO'UTH BOSTON, VIBGINIA, ASSIGNOB TO BICCBLNE, OF WASHINGTON, DISTBIC'I' OF COLUMBIA.

VALVE-LIFTING MECHANIS,

Specification of Letters Patent.

Application led November 22, 1916. Serial No. 132,880.

To all 'whom z't may concem: w

Be it known .that I, WILLIAM J. SNA- Dncxr, a citizen of the UnitedStates,'and a resident of South Boston, in the county of Halifax andState of Virginia, have mvented a certain new and useful Improvement inValve-Lifting Mechanism, of which the following is a specification.

One of the principal objects of my lnvention is to provide an improvedarrangement of valve lifts for valve-in-head motors, in which the springcontrol is arranged on the rock arm lift rod and is connected with thetappet guide at the' side of the cylinder, whereby the total height ofthe engine is materially decreased; noise is minimized, and eflicientbearings and guides for the lift rod are provided.`

Another object of the inventlon is to provide an improved valve lift inwhich a casing Vis connected with the tappet guide, in which casing isarranged the spring which controls the lift rod, whereby advantages ofan improved bearing and guide for the rod are obtained and wherebyprotection for the control spring from dust and other foreign matter isacquired.

Still another object of the inventlon is to provide an improved deviceofthe class described, which will be extremely simple, durable, eflicientin operation and inexpensive to manufacture.

With these and other objects i in view, which will become .apparent asthel description proceeds, the invention resides/in the construction,combination, and arrangement of parts hereinafter more fully describedand claimed, and illustrated in the accompanying drawings, in which likecharacters indicate like or corresponding .parts throughout the severalviews; and in which Figure 1 represents a view in section takenvertically and transversely through an engine cylinder, showing thearrangement of the valve lift thereon;

Fig. 2 represents a detail sectional view taken horizontally on theplane indicated by the line 2-2 of Fig. 1.

Referring more particularly to the drawing, 5 indicates one of theengine cylinders having an inlet valve 6 in its head, which valve seatson the valve. seat 7. The 'cam shaft is indicated at 8 'and is operatedi'n the usual manner, and carries a cam 9 coacting with a roller 10arrangecl on the tappet 11 for intermittently lifting this tappet I asthe cam shaft rotates. The tappet. 11 reciprocates through a guide 12which is screwed down as at 13 into an opening provlded. in the enginecasing 14, alongside of the cyhnder. The tappet guide 12 is providedwith a peripheral flange 15 which abuts. against the upper surface ofthe caslng adjacent the opening 'into which the tappet guide is screwed.

The hft rod 16 is arranged alongside of the cylinder as is usual,extends through a bearing 17 on the cylinder casing, and at its lowerend projects into a socket 18 provided in the tappet 11. Surrounding thelower portion of the lift rod is a cone shaped metallic casing 19internally threaded at its lower end whereby to be screwed in place uponthe upper externally threaded end of the tappet guide 12, as clearlyshown. The upper portion of the casing l19 is provided with anenlargement or boss 20, through a bore in which. the lift rod 16slidably extends. A good bearing and guide is thus provided forthe lowerportion of the lift rod.

The lower end of the rod16 is threaded and has screwed upon it anannular spring seat 21, which on its upper face is provided with acircular groove receiving the lower end of a spiral spring 22. The upperend of this spring seats in a groove provided in the upper end of thecasing 19 around the base of the bearing 20. A jam nut is turned ontothe rod 16 below the spring seat 21 into engagement therewith and looksthe seat in position. This nut also forms a seat against which thetappet 11 Strikes in' order to lift the rod 16 when the engine isrunning. It will be noticed that normally a space occurs between the nut22 and the upper end of the tappet so that when the tappetengages thenut upon being lifted by the cam 9, the rod will be suddenly and quicklylifted and will be as quickly released when the cam will have passedfrom beneath the tappet. The spring 22 exerts a tension downwardly onthe left rod 16 for normally retaining the valve 6 in closed position.It will be understood that in assembling the parts, when the casing 19is screwed down, the upper end of the spring will be engaged thereby andthe spring will be compressed as the casing is screwed on, so that itwill continuously exert a tension -downwardly upon i be opened andclosed along a straight the rod. The tension of the spring may be variedby turning the casing 19 in one direction or another so as to lift orlower the same to the desired degree, and any wear occurring between thetappet and rod may be taken up by adjusting the jam nut and..

lower spring holder up or down.

The arrangement which I have provided,

and grime, or other foreign matter, and

also a material reduction in noise is attained.

The upper end of the lift rod 16 is pivotally connected as at 24 withthe outer end of a rocker arm 25, which arm is pivotally mounted at 26on a post 27 carried on the ,cylinder head. The inner end of the rockarm 25 is connected by means of the links 28 and 29 with the valve stem30, and this link connection allows of the oscillation of the arm 25 inopening and closing the valve 6 without any tendency'for a lateral pullagainst thev valve so that no friction' will result from this account,but the valve 1will ine lso as to always seat properly when in closedposition.

Altl'iough have described the preferred embodiznent of my invention, imay desire to make such changes in the construction, combination andarrangement of parts thereof as do not depart from the spirit of theinvention and the scope of the appended claims. t

ri`he arrangement whereby the lower end of the rod projects into thesocket provided in the tappet, aifords a guide for the lower end of therod, which will prevent the lower portion of the rod from becoming bentor warped.

:i claim:

1. An engine valve lift, including a lift rod, a tappet guide, a conicalcasing adjustably connected with the tappet guide and surrounding thelift rod and having a bearing at its upper end through which the liftrod plays, an annular spring seat threaded onto the lift rod within thecasing, a jam nut threaded onto the rod into engagement with the springseat, and a coil spring compressed between said spring seat and theopposed end of the casing.

iaaasas 2. An engine valve lift, includin a lift rod, a tappet guide, acasing adjusta ly connected with the tappet guide and surrounding thelift rod, a spring seat adjustably mounted on the lift rod within thecasing, and a coil spring compressed between the valve seat and theopposed end of said casing.

8. The combination with an engine, including a valve lift rod, of acasing surrounding the lift rod, and adjustably connected with theengine for adjustment longitudinally of the rod, a spring seatadjustably mounted on the rod within the casing, and a compressed springinterposed between the spring seat and the opposed end of the casing.

4. An engine valve lift includin a lift rod, a tappet guide, a casingadjusta ly connected with the tappet guide, means on the casing forminga bearing for the lift rod, a spring seat mounted 'on the lift rodwithin the casing, and a spring interposed between the spring seat andbearing.

5. The combination with an engine including a valve lift rod, a tappetfor actuating the same in one direction and a guide for the tappet; of acasing a'djustably connected with the guide and surrounding the rod, andmeans mounted within the casing exerting a tension against the rod in adirection opposed to the direction in which the tappet actuates the rod.

6. The combination with a motor including a cylinder, a lift rodandatappet guide, of means for spring `tensioning the lift rod, and meansmounted beside the cylinder on the tappet guide for controlling thespring tension.

7. An engine valve lift, including a tappet having 'a socket in one end,a lift rod projecting at one end into the socket, and s ring tensionmeans associated with the li rod including a j am nut mounted on thelift rod in spaced relation with the socketed end of the tappet when thelatter is in normal position, said jam nut forming a bearing againstwhich the tappet Strikes.

8. The combination with a valve lift rod, and tappet guide, of a casingsurrounding the lift rod and adjustably connected with the tappet'guide, a spring seat adjustably mounted on the lift rod, and tensioningmeans interposed between the spring seat and the casing.

WILLIAM JOHN SNADECKI Witnesses:

J. T. LAoY, JNo. C. LAwsoN.

